<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      div {
        display: flex;
        width: 600px;
        height: 400px;
        background-color: pink;
        /* 项目是否换行 */
        /* flex-wrap: nowrap; */
        flex-wrap: wrap;
      }
      div span {
        width: 150px;
        height: 100px;
        background-color: purple;
        color: #fff;
        margin: 10px;
      }
    </style>
  </head>
  <body>
    <div>
      <span>1</span>
      <span>2</span>
      <span>3</span>
      <span>4</span>
      <span>5</span>
    </div>
  </body>
</html>
